/*
 * Copyright (c) 2019  STMicroelectronics – All rights reserved
 * The STMicroelectronics corporate logo is a trademark of STMicroelectronics
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice, this list of conditions
 * and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above copyright notice, this list of
 * conditions and the following disclaimer in the documentation and/or other materials provided
 * with the distribution.
 *
 * - Neither the name nor trademarks of STMicroelectronics International N.V. nor any other
 * STMicroelectronics company nor the names of its contributors may be used to endorse or
 * promote products derived from this software without specific prior written permission.
 *
 * - All of the icons, pictures, logos and other images that are provided with the source code
 * in a directory whose title begins with st_images may only be used for internal purposes and
 * shall not be redistributed to any third party or modified in any way.
 *
 * - Any redistributions in binary form shall not include the capability to display any of the
 * icons, pictures, logos and other images that are provided with the source code in a directory
 * whose title begins with st_images.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
 * OF SUCH DAMAGE.
 */

import Foundation
import SmarTagCloudLibCommon
import CoreLocation

class SmarTagLocationService : NSObject, CLLocationManagerDelegate{
    
    private let locationManager = CLLocationManager()
    private var onComplete:((Location?)->())?
    
    override init(){
        super.init()
        locationManager.delegate = self
        locationManager.desiredAccuracy = kCLLocationAccuracyBest
    }
    
    func readCurrentLocation(onComplete:@escaping (Location?)->()){
        self.onComplete = onComplete
        manageLocationStatus(CLLocationManager.authorizationStatus())
    }
    
    public func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]){
        guard let location = locations.first else{
            onComplete?(nil)
            return
        }

        manager.stopUpdatingLocation()
        let loc = Location(latitude: location.coordinate.latitude,
                           longitude: location.coordinate.longitude,
                           timestamp: location.timestamp)
        onComplete?(loc)
    }
    
    
    
    public func locationManager(_ manager: CLLocationManager, didFailWithError error: Error){
        print(error)
        onComplete?(nil)
    }
    
    public func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus){
        manageLocationStatus(status)
    }

    private func manageLocationStatus( _ status:CLAuthorizationStatus){
        switch status {
        
        case .restricted, .denied:
           onComplete?(nil)
           break
            
        case .authorizedWhenInUse, .authorizedAlways:
           locationManager.requestLocation()
           break
                    
        case .notDetermined:
           locationManager.requestWhenInUseAuthorization()
           break
        @unknown default:
            onComplete?(nil)
        }
    }
    
}
